Acoustical identification of the concentration layer of a copepod species, Calanus euxinus

Date

2003-03-01

Author

Mutlu, E

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

134
views

0
downloads

Swimming trajectories of Calanus euxinus Hulsemann in the Black Sea were studied using an echosounder at 120 and 200 kHz. C. euxinus were acoustically discriminated with respect to vertical migration and swimming speed, according to dissolved oxygen (DO) concentration and the timing of migrations. Species became torpid in water with DO values < 0.5 mg l(-1). The time spent swimming under DO conditions between 2 and 5 mg l(-1) was insignificant, and varied greatly from the 10% to 25% of total time spent swimming under normoxic conditions (5-10 mg l(-1)). C. euxinus formed a concentration layer in the water of 1-3 in thickness. Upward migration was completed in about 3.5 h, starting 2.5 h before and ending 1h after sunset (average rate: 0.95 cm s(-1)) in summer. Species ascended discretely from the suboxic to the lower boundry of the cold intermediate layer (CIL) at 0.82 cm. s(-1) and passed up the CIL and thermocline fast (2.3 cm s(-1)). Downward migration took less time (2 h), starting similar to1 h before and ending similar to1 h after sunrise. Swimming speed within the thermocline and CIL was 2.7 cm s(-1); copepods subsequently returned to daylight depth at a sinking speed of 0.57 cm s(-1). Total time for C. euxinus to settle to their nocturnal depth layer was about 5 h.

Subject Keywords

South-western part, Black-sea, Vertical-distribution, Sound-scattering, Target strength, Zooplankton, Migration, Jellyfish, System

URI

https://hdl.handle.net/11511/64079

Journal

MARINE BIOLOGY

DOI

https://doi.org/10.1007/s00227-002-0986-3

Collections

Graduate School of Marine Sciences, Article

Suggestions

OpenMETU
Core

Diel vertical migration of Sagitta setosa as inferred acoustically in the Black Sea Mutlu, E (Springer Science and Business Media LLC, 2006-06-01) Swimming trajectories of chaetognaths Sagitta setosa Muller in the Black Sea were studied using an echosounder operating at 120 and 200 kHz and an acoustic Doppler current profiler (ADCP) operating at 150 kHz. S. setosa were acoustically discriminated with respect to vertical migration and swimming speed, according to dissolved oxygen (DO) concentration and the timing of migrations. S. setosa formed a concentration layer thicker than Calanus euxinus did (1-3 m). The migration was completed in about 2.5-4 h,...
Porewater redox species and processes in the Black Sea sediments Konovalov, Sergey K.; Luther, George W.; Yücel, Mustafa (2007-11-15) During the 2003 KNORR and the 2005 ENDEAVOR cruises to the Black Sea, voltammetric solid-state microelectrode data were collected for the vertical distribution of redox species in porewaters from the upper 200 to 300 mm layer of sediments with nun vertical resolution. We discuss vertical distributions of dissolved sulfide, manganese and iron species in sediments from the oxic, suboxic, anoxic/sulfidic parts of the Black Sea. Results of voltammetric profiling demonstrate many processes governing the porewate...
Basement structure and architecture of the Black Sea Basin Kaymakcı, Nuretdin; Horn, Brian (null; 2018-01-28) Black Sea consists of two separate back arc basins which opened at different times during the Cretaceous in response to northward subduction of the Neo-Tethys Ocean. The paucity of well data, complex geometries and seismic imaging challenges mean that questions remain regarding the basement architecture though most authors accept that, at least in part, both these basins are floored by oceanic crust, even though there are no magnetic stripes. Interpretation of deep, long offset seismic data (imaging to more...
Vertical distribution of marine cyanobacteria Synechococcus spp. in the Black, Marmara, Aegean, and eastern Mediterranean seas Uysal, Zahit (2006-01-01) The vertical distributions of the unicellular cyanobacteria Synechococcus were studied in several highly contrasting seas: the Black Sea, Sea of Marmara, Aegean Sea, and Mediterranean Sea. Cell abundances varied significantly on both vertical and horizontal scales in all physically and spatially discrete water masses. Epifluorescence microscope cell counts from all seas clearly showed that majority of the population remains suspended in the surface-mixed layer and decreases gradually towards the base of the...
Flow dynamics and mixing processes in hydraulic jump arrays: Implications for channel-lobe transition zones Dorrell, R. M.; Peakall, J.; Sumner, E. J.; Parsons, D. R.; Darby, S. E.; Wynn, R. B.; Ozsoy, E.; Tezcan, Devrim (2016-11-01) A detailed field investigation of a saline gravity current in the southwest Black Sea has enabled the first complete analysis of three-dimensional flow structure and dynamics of a series of linked hydraulic jumps in,stratified, density-driven, flows. These field observations were collected using an acoustic Doppler current profiler mounted on an autonomous underwater vehicle, and reveal that internal mixing processes in hydraulic jumps, including flow expansion and recirculation, provide a previously unreco...

Citation Formats

E. Mutlu, “Acoustical identification of the concentration layer of a copepod species, Calanus euxinus,” MARINE BIOLOGY, pp. 517–523, 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64079.